T/R module for satellite TT and C ground link
a satellite and ground link technology, applied in the direction of antennas, modular arrays, electrical devices, etc., can solve the problems of long downtime for repair and maintenance, operators cannot quickly schedule consecutive satellite contacts, and single point failures
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[0027]Referring to FIG. 1, represented are the dual channel transmitter signal inputs 8, 22 and dual receiver signal outputs 1, 26 of the present invention. The transmit frequency of operation is 1.75–2.1 GHz. The receiver frequency of operation is 2.2–2.3 GHz. Each of the dual transmit paths consists of an input 8 or 22 and output to either of the two diplexed antenna ports 11 and 40. The transmitter signal passes through a four-bit phase shifter, 27 or 39 (φ shift of 22.5°, 45°, 90°, 180°), a SPDT switch, 9 or 32 that is used to open / close the RF path, a five-bit attenuator, 10 or 28 (attenuation levels of 1 dB, 2 dB, 4 dB, 8 dB, 16 dB), a pre amplifier, 15 or 31 and then through another absorptive type SPDT switch 16 or 30 before reaching the embedded power combiner 14 or 29. The absorptive SPDT switch is used to induce left hand circular polarization (LHCP) and right hand circular polarization (RHCP) in the signal. A 90-degree hybrid, 25 is used to provide quadrature phase in th...
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